Measurement of the atmospheric neutrino flavour composition in Soudan 2

Allison, W.W.M.; Alner, G. J.; Ayres, D. S.; Barrett, W. L.; Bode, C.; Border, P.; Brooks, C.B.; Cobb, J.H.; Cockerill, D. J. A.; Cotton, R.; Courant, H.; DeMuth, D. M.; Fields, T.; Gallagher, H.; García, C.; Goodman, M. C.; Gray, R.; Johns, K.; Kafka, T.; Kasahara, S. M S; Leeson, W.; Litchfield, P. J.; Longley, N. P.; Löwe, M.; Mann, W. A.; Маршак, М. Л.; May, E. N.; Milburn, R. H.; Miller, William H.; Mualem, L.; Napier, A.; Oliver, W. P.; Pearce, G. F.; Perkins, D. H.; Peterson, E. A.; Petyt, D.; Price, L. E.; Roback, Donald M.; Ruddick, K.; Schmid, D.; Schneps, J.; Schub, M. H.; Seidlein, R.; Shupe, M.; Stassinakis, A.; Sundaralingam, N.; Thomas, J. C.; Thron, J. L.; Vassiliev, V. V.; Villaume, G.; Wakely, S. P.; Wall, D.; Werkema, S.; West, N.; Wielgosz, U.M.

doi:10.1016/s0370-2693(96)01609-7

Cited by 326 publications

(94 citation statements)

References 11 publications

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“…The same indication comes from the older data of the Kamiokande [6] and IMB [7] experiments and the recent ones of Soudan-2 [8]. Also the results recently presented by the MACRO collaboration [9,10] indicate a suppression of the muon (anti)-neutrino flux.…”

Section: Introductionsupporting

confidence: 55%

On exotic solutions of the atmospheric neutrino problem

Lusignoli

2000

Nuclear Instruments and Methods in Physics Research Section A:

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The measurements of the fluxes of atmospheric neutrinos give evidence for the disappearance of muon neutrinos. The determination of the dependence of the disappearance probability on the neutrino energy and trajectory allows in principle to establish unambiguosly the existence of neutrino oscillations. Alternative mechanisms for the disappearance of the neutrinos have been proposed, but do not provide a viable description of the data, if one includes both events where the neutrinos interact in the detector and ν-induced upward going muons. The proposed mechanisms differ in the energy dependence of the disappearance probability and the upward going muon data that are produced by high energy neutrinos give a crucial constraint.

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Section: Introductionsupporting

confidence: 55%

On exotic solutions of the atmospheric neutrino problem

Lusignoli

2000

Nuclear Instruments and Methods in Physics Research Section A:

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“…In the standard paradigm of three-active-neutrino mixing occurring at the solar [2,3,4,5,6,7,8] and atmospheric [9,10,11,12,13,14] oscillation scales only, leptonic CP violation would yield different vacuum oscillation probabilities for neutrinos and antineutrinos that could be observed, for example, with accelerator-based neutrino oscillation appearance experiments operating near the atmospheric oscillation maximum [15,16]. This is because CP-odd terms in the oscillation probability formula would appear from solar/atmospheric interference terms involving the single CP-violating Dirac phase appearing in the neutrino mixing matrix [17].…”

Section: Introductionmentioning

confidence: 99%

LeptonicCPviolation studies at MiniBooNE in the (3+2) sterile neutrino oscillation hypothesis

et al. 2007

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We investigate the extent to which leptonic CP-violation in (3+2) sterile neutrino models leads to different oscillation probabilities forνµ →νe and νµ → νe oscillations at MiniBooNE. We are using a combined analysis of short-baseline (SBL) oscillation results, including the LSND and null SBL results, to which we impose additional constraints from atmospheric oscillation data. We obtain the favored regions in MiniBooNE oscillation probability space for both (3+2) CP-conserving and (3+2) CP-violating models. We further investigate the allowed CP-violation phase values and the MiniBooNE reach for such a CP violation measurement. The analysis shows that the oscillation probabilities in MiniBooNE neutrino and antineutrino running modes can differ significantly, with the latter possibly being as much as three times larger than the first. In addition, we also show that all possible values of the single CP-violation phase measurable at short baselines in (3+2) models are allowed within 99% CL by existing data.

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“…[S0031-9007(99) PACS numbers: 14.60. Pq, 14.60.St, 25.30.Pt, 96.40.Tv Neutrinos produced as decay products in hadronic showers from cosmic ray collisions with nuclei in the upper atmosphere [1] have been observed by several detectors [2][3][4][5][6][7]. Although the absolute fluxes of atmospheric neutrinos are largely uncertain, the expected ratio ͑m͞e͒ of the muon neutrino flux ͑n m 1n m ͒ over the electron neutrino flux ͑n e 1n e ͒ is robust, since it largely cancels out the uncertainties associated with the absolute flux.…”

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confidence: 99%

“…Moreover, not long ago, the Soudan-2 Collaboration, also using an iron calorimeter, reported a small value of R͑m͞e͒ [7], showing that the so-called atmospheric neutrino anomaly was not a feature of water Cherenkov detectors.…”

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confidence: 99%

Atmospheric Neutrino Observations and Flavor Changing Interactions

et al. 1999

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Flavor changing (FC) neutrino-matter interactions can account for the zenith-angle-dependent deficit of atmospheric neutrinos observed in the SuperKamiokande experiment, without directly invoking either neutrino mass or mixing. We find that FC n m -matter interactions provide a good fit to the observed zenith angle distributions, comparable in quality to the neutrino oscillation hypothesis. The required FC interactions arise naturally in many attractive extensions of the standard model. [S0031-9007(99) PACS numbers: 14.60. Pq, 14.60.St, 25.30.Pt, 96.40.Tv Neutrinos produced as decay products in hadronic showers from cosmic ray collisions with nuclei in the upper atmosphere [1] have been observed by several detectors [2][3][4][5][6][7]. Although the absolute fluxes of atmospheric neutrinos are largely uncertain, the expected ratio ͑m͞e͒ of the muon neutrino flux ͑n m 1n m ͒ over the electron neutrino flux ͑n e 1n e ͒ is robust, since it largely cancels out the uncertainties associated with the absolute flux. In fact, this ratio has been calculated [1] with an uncertainty of less than 5% over energies varying from 0.1 to 100 GeV. In this resides our confidence in the longstanding atmospheric neutrino anomaly.Although the first iron-calorimeter detectors in Fréjus [2] and NUSEX [3] reported a value of the double ratio, R͑m͞e͒ ͑m͞e͒ data ͑͞m͞e͒ MC , consistent with one, all of the water Cherenkov detectors, Kamiokande [4], IMB [5], and SuperKamiokande [6], have measured R͑m͞e͒ significantly smaller than one. Moreover, not long ago, the Soudan-2 Collaboration, also using an iron calorimeter, reported a small value of R͑m͞e͒ [7], showing that the so-called atmospheric neutrino anomaly was not a feature of water Cherenkov detectors.Recent SuperKamiokande high statistics observations [6] indicate that the deficit in the total ratio R͑m͞e͒ is due to the number of neutrinos arriving in the detector at large zenith angles. Although e-like events do not present any compelling evidence of a zenith angle dependence, the m-like event rates are substantially suppressed at large zenith angles.The n m ! n t [6,8], as well as the n m ! n s [8,9], oscillation hypothesis provides an appealing explanation for this smaller-than-expected ratio, as they are simple and well motivated theoretically. This led the SuperKamiokande Collaboration to conclude that their data provide good evidence for neutrino oscillations and neutrino masses.In this Letter we give an alternative explanation of the atmospheric neutrino data in terms of flavor changing (FC) neutrino-matter interactions [10][11][12][13][14]. We show that, even if neutrinos have vanishing masses and/or the vacuum mixing angle is negligible, FC neutrino-matter interactions can still explain the SuperKamiokande data.There are attractive theories beyond the standard model (SM), where neutrinos are naturally massless [15] as a result of a protecting symmetry, such as B-L in the case of supersymmetric SU͑5͒ models [16] and the model proposed in [17], or chiral symmetry in theories w...

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Measurement of the atmospheric neutrino flavour composition in Soudan 2

Cited by 326 publications

References 11 publications

On exotic solutions of the atmospheric neutrino problem

On exotic solutions of the atmospheric neutrino problem

LeptonicCPviolation studies at MiniBooNE in the (3+2) sterile neutrino oscillation hypothesis

Atmospheric Neutrino Observations and Flavor Changing Interactions

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